scholarly journals Synthesis and Fluorescence Spectroscopic Studies of Novel 9-phenylacridino-18-crown-6 Ether Type Sensor Molecules

2017 ◽  
Vol 61 (4) ◽  
pp. 249 ◽  
Author(s):  
Tamás Németh ◽  
Tünde Tóth ◽  
György Tibor Balogh ◽  
Péter Huszthy

The synthesis of two new 9-phenylacridino-18-crown-6 ether type sensor molecules [1 and (R,R)-2] was accomplished. The cation recognition ability of the achiral sensor molecule 1 towards various ions was studied in acetonitrile by UV/Vis and fluorescence spectroscopies. Our studies revealed the binding of Ag+, Cd2+, Ni2+, Pb2+, Zn2+ and NH4+ ions by the latter molecule. Selectivity of the chiral dimethyl-substituted analogue (R,R)-2 was studied toward the enantiomers of the hydrogen perchlorate salts of 1-phenylethylamine, 1-(1-naphthyl)ethylamine, phenylglycine methyl ester and phenylalanine methyl ester using fluorescence spectroscopy.

2014 ◽  
Vol 4 (4) ◽  
pp. 1132-1143 ◽  
Author(s):  
Zhangping Shi ◽  
Xiuzhen Xiao ◽  
Dongsen Mao ◽  
Guanzhong Lu

Efficient catalytic hydrogenation of l-phenylalanine methyl ester to l-phenylalaninol over the Cu/ZnO/Al2O3 catalyst with ~100% ee selectivity.


1992 ◽  
Vol 22 (3) ◽  
pp. 593-596 ◽  
Author(s):  
Pradeep K. Arg ◽  
Sudha Garg ◽  
William G. Degraff ◽  
Michael R. Zalutsky ◽  
James B. Mitchell

1986 ◽  
Vol 51 (7) ◽  
pp. 1126-1128 ◽  
Author(s):  
Claudio Fuganti ◽  
Piero Grasselli ◽  
Luciana Malpezzi ◽  
Paolo Casati

1998 ◽  
Vol 54 (6) ◽  
pp. 907-911 ◽  
Author(s):  
H. Hosomi ◽  
Y. Ito ◽  
S. Ohba

Dissymmetry of the photoproduct was induced by using a chiral substituent, (S)-methylphenylalanine, in the title compound {N-4-(2,4,6-triisopropylbenzoyl)benzoyl]-(S)-phenylalanine methyl ester (I)}. On irradiation with light from a 250 W ultra-high-pressure Hg lamp for 7 h through a long-pass filter, the photoreaction in a crystal was 100% complete without the loss of crystallinity. The crystal structures (I), before, and (II) {N-[4-(7-hydroxy-3,5-diisopropyl-8,8-dimethylbicyclo[4.2.0]octa-1,3,5-trien-7-yl)benzoyl]-(S)-phenylalanine methyl ester}, after photocyclization, have been determined by X-ray diffraction. For comparison, a crystal structure analysis has also been carried out for the photoproduct (III) of the 3′-COOMe derivative after recrystallization {methyl 3-(7-hydroxy-3,5-diisopropyl-8,8-dimethylbicyclo[4.2.0]octa-1,3,5-trien-7-yl)benzoate}. The dihedral angle between the central carbonyl plane and the triisopropylphenyl ring deviates from 90° by 10 (1)° in (I), which makes an imbalance in the intramolecular O(carbonyl)...H(methine) distances of the isopropyl groups at positions 2 and 6. The crystal structure of (II) indicates that the nearer methine H was predominantly abstracted by the carbonyl O atom in the reaction. The absolute configuration around the asymmetric C atom in the cyclobutenol ring of the product is S.


2019 ◽  
Vol 48 (35) ◽  
pp. 13169-13175 ◽  
Author(s):  
Akinobu Sumiyoshi ◽  
Yusuke Chiba ◽  
Ryota Matsuoka ◽  
Takumu Noda ◽  
Tatsuya Nabeshima

Heavy group 13 element complexes of N2O2- and N2O4-type dipyrrins exhibited efficient luminescent properties and cation recognition ability.


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